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PART I Page 8 Permit No. CO-0044776 A. DEFINTIION OF EFFLUENT LIMITATIONS • 6. Whole Effluent Toxicity Testing Requirements (Acute) - OutfaLl 002 (continued) ii. The PTI/TIE results indicate that the toxicant(s) represent pollutant(s) tha[ may be controlled with specific numerical limits, and the Division agrees that the numerical controls are [he most appropriate course of action. iii. The PTI/TIE reveals other unique conditions or characteristics which, in the opinion of the Division, justify the incorporation of unanticipated special conditions in the permit. B. MOMTORING REQUIREMENTS 1. Frequency and Sample Tvne In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A.1, the permittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin immediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring Reports (DMR) (see Part I.E.1. for routine reporting requirements). Also see Pan I.B.2. for additional monitoring requirements. a. Outfalls OOl and 003 Effluent Parameter Measurement Freq encv Sample Tyue Flow, MGD Weekly Instantaneous or Continuous Total Suspended Solids, mglt! Mont}tly Grab Total Iron, mg/Q Monthly Grab Settleable Solids, mP/P Mont}ily Grab Oil and Grease, mg/Q Weekly Visual pH, s.u. Weekly In-sim b. Qsitfa11002 Effluent Parameter Measurement Frequencv Sample Tyne Flow, MGD Weekly Instantaneous or Continuous Total Suspended Solids, mg/Q Monthly Grab Total Iron, mg/Q Monttily Grab Settleable Solids, mQ/Q Monthly Grab Oi] and Grease, mg/P Weekly Visual pH, s.u. Weekly In-situ Whole Effluent Tonicity, Acute Quarterly Grab c. Oil and Grease Moni[orine For every outfall with oil and grease monitoring, in the event an oil sheen or floa[ing oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR. [n addition, corrective action shall be taken immediately to mitigate the discharge of oil and grease. A descrip[ion of the corrective action taken • should be included with the DMR. Self-monitoring sampling by [he petmittee for compliance with the monitoring requirements specified above shall be performed at the following locations: outfalls 001. 002 and 003 -- al( after final treatment and prior to entering Deer Trail Ditch. ~ .., .. See Part I,C. for Defu>itions. Amendment No. 1 Issued '~~ Effective